Briefly Introduce The Necessity Of Industrial Boiler Cleaning
Due to the long running time of the boiler, problems such as scaling and rusting will inevitably occur. The main cause of boiler scaling is the hard components in the water. After continuous evaporation and concentration at high temperature and high pressure, a series of physical problems will occur in the furnace. , The chemical reaction finally forms a hard and dense scale on the heated surface. Scale is the "first of all hazards" for boilers and the main cause of boiler accidents. The main hazards are:
Waste a lot of fuel: Since the thermal conductivity of scale is only one-tenth of that of steel materials, when scale is heated to the surface, it will hinder heat transfer. In order to maintain a certain output of the boiler, the temperature on the fire side must be increased. This results in heat loss due to outward radiation and smoke exhaust. According to different boiler working pressures, different types and thicknesses of scale, and different fuel consumption, the ratio of scale thickness to fuel consumption is obtained through experiments and calculations: when scale thickness (S) ≥ 1 mm, fuel consumption is 5~13%; when 2mm, fuel consumption is 13~18%; when 3mm, fuel consumption is 18~26%.
It is easy to cause the steel plate and pipe to burn out due to overheating: after the boiler is fouled, it is necessary to maintain a certain working pressure and evaporation capacity, which can only increase the fire side temperature, but the thicker the scale, the lower the thermal conductivity and the higher the fire side temperature. high. In general, the temperature on the fire side of the boiler is about 900°C, and the temperature on the water side is about 190°C. The temperature of the non-scaling steel sheet is about 230°C. Once the scale is about 1mm, the temperature will increase by about 140°C compared with the non-scaling steel sheet. When the temperature is 315℃, the plasticity index of 20# steel plate begins to decrease, and when it reaches 450℃, the steel plate undergoes overheating creep deformation. Therefore, boiler fouling can easily cause metal burning.
Increase maintenance costs and shorten service life: boiler accidents caused by scale account for about one-third of all boiler accidents, which is still on the rise, not only causing equipment damage, but also endangering personal safety. Therefore, when the feed water is qualified, the boiler should strictly control the water in the boiler to meet the national standards during operation; prevent the generation of scale during operation, and deal with the scale in time, and thoroughly prevent and remove the scale in the boiler furnace. And control the water quality. In order to solve the above problems, the most scientific method at present is to maintain the boiler with good comprehensive performance and comprehensive efficacy and regular cleaning and descaling during the operation of the boiler.
According to different boiler working pressures, different types and thicknesses of scale, and different fuel consumption, the ratio of scale thickness to fuel consumption is obtained through experiments and calculations: when scale thickness (S) ≥ 1 mm, fuel consumption is 5~13%; when 2mm, fuel consumption is 13~18%; when 3mm, fuel consumption is 18~26%. It is easy to cause steel plates and pipes to burn out due to overheating: after the boiler is fouled, it is necessary to maintain a certain working pressure and evaporation capacity, which can only increase the fire side temperature, but the thicker the scale, the lower the heat transfer coefficient, and the higher the fire side temperature high. Scale is the "first of all hazards" in boilers and is the main cause of boiler accidents. Its hazards are mainly manifested in: large fuel waste: because the thermal conductivity of scale is only several times that of steel materials, when the scale is heated, heat transfer It will be blocked. In order to maintain the normal operation of the boiler, the temperature of the furnace body must be increased, so as to radiate outward and exhaust the flue gas, causing heat loss.
In general, the temperature on the fire side of the boiler is about 900°C, and the temperature on the water side is about 190°C. The temperature of the non-scaling steel sheet is about 230°C. Once the scale is about 1mm, the temperature will increase by about 140°C compared with the non-scaling steel sheet. When the temperature is 315℃, the plasticity index of 20# steel plate begins to decrease, and when it reaches 450℃, the steel plate undergoes overheating creep deformation. Therefore, boiler fouling can easily cause metal burning. Increase maintenance costs and reduce service life: boiler scale accidents account for about one-third of the total number of boiler accidents, which is still on the rise, not only causing equipment damage, but also endangering personal safety. Therefore, when the feed water is qualified, the boiler should strictly control the water in the boiler to meet the national standards during operation; prevent the generation of scale during operation, and deal with the scale in time, and thoroughly prevent and remove the scale in the boiler furnace. And control the water quality. In order to solve the above problems, the most scientific method at present is to maintain the boiler with good comprehensive performance and comprehensive efficacy and regular cleaning and descaling during the operation of the boiler.
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